<div class="card">
    <div class="card-body">
        <a href="#" class="btn btn-primary w-100"><i class="fa-regular fa-pen-to-square"></i>我要发帖</a>
    </div>
</div>

<br>

<div class="card mb-3" >
    <div class="card-body">
        <h5 class="card-title">Special title treatment</h5>
        <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
        <a href="#" class="btn btn-primary">Go somewhere</a>
    </div>
</div>



<div class="card text-bg-dark mb-3" >
    <div class="card-header">Header</div>
    <div class="card-body">
        <h5 class="card-title">Dark card title</h5>
        <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    </div>
</div>
